What you should do is modify your master image so that your cloned machines in the future don't have this issue. Before sysprepping, run:
Remove-ItemProperty -Name AccountDomainSid, PingID, SusClientId, SusClientIDValidation -Path HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\ -ErrorAction SilentlyContinue
To fix your current issue, delete all affected computers from the WSUS MMC Console and then run the client side script ONCE on every affected computer.
https://www.ajtek.ca/wsus/client-machines-not-reporting-to-wsus-properly/